<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>轮播图</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        body {
            display: flex;
            height: 100vh;
            justify-content: center;
            align-items: center;
        }

        .a {
            position: relative;
            width: 650px;
            display: flex;
            justify-content: space-evenly;
        }

        .b {
            width: 400px;
            height: 500px;
            transition: .4s;
            background-size: cover;
        }

        .c {
            width: 200px;
            height: 500px;
            display: flex;
            /* 纵向布局 */
            flex-direction: column;
            justify-content: space-between;
        }

        .d {
            position: relative;
            width: 200px;
            height: 90px;
            right: 0;
            transition: .5s;
            overflow: hidden;
        }

        .d img {
            position: absolute;
            width: 200px;
            /* 小图片上移 */
            transform: translate(0, -50px);
            transition: .5s;
            right: 0;
        }

        .d.dd {
            opacity: 0;
            right: 250px;
        }

        .d:hover img {
            opacity: 0;
            right: 250px;
        }
    </style>
</head>

<body>
    <div class="a">
        <div class="b"></div>
        <div class="c">
            <div class="d dd"><img src="./images/1.png" alt=""></div>
            <div class="d"><img src="./images/2.png" alt=""></div>
            <div class="d"><img src="./images/3.png" alt=""></div>
            <div class="d"><img src="./images/4.png" alt=""></div>
            <div class="d"><img src="./images/5.png" alt=""></div>
        </div>
    </div>
    <script>
        // 获取左边大图元素
        let b = document.querySelector(".b")
        // 获取右边小图的所有元素
        let d = document.getElementsByClassName("d")

        let time
        let index = 0

        // 设置一个重置函数
        let a = function () {
            for (let i = 0; i < d.length; i++) {
                d[i].className = "d"
            }
        }
        // 设置一个选中函数
        let aa = function () {
            // 先代入重置函数
            a()
            d[index].className = "d dd"
        }
        // 设置启动轮播图的时间函数
        function ts() {
            time = setInterval(function () {
                aa()
                index++
                b.style.backgroundImage = "url('./images/" + [index] + ".png')"
                if (index == 5) {
                    index = 0
                }
            }, 1500);
        }
        for (let i = 0; i < d.length; i++) {
            // 鼠标移动到当前小图片上时触发
            d[i].onmousemove = function () {
                // 鼠标移动到当前小图片时右边大图片变成当前的小图片
                b.style.backgroundImage = "url('./images/" + [i + 1] + ".png')"
                // 鼠标移动到小图片上面时关闭定时器并重置定时，
                // 鼠标移开后再继续执行
                a()
                clearInterval(time)
                index = i + 1
                ts()
            }
        }
        ts()
    </script>
</body>

</html>